Senior Security Engineer (AI Security)

About Nu

Nu is the leading digital bank in Latin America, serving 135 million customers across Brazil, Mexico, and Colombia. The company has been leading an industry transformation by leveraging data and proprietary technology to develop innovative products and services.

Guided by its mission to fight complexity and empower people, Nu caters to customers’ complete financial journey, promoting financial access and advancement with responsible lending and transparency. The company is powered by an efficient and scalable business model that combines low cost to serve with growing returns.

Nu’s impact has been recognized in multiple awards, including Time 100 Most Influential Companies, Fast Company’s Most Innovative Companies, and Forbes World’s Best Banks.

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About the role

We are looking for a Senior Security Engineer to work closely with our teams to strengthen the security and resilience of our AI ecosystem. In this role, you will identify and assess security risks across machine learning models and Generative AI applications, design and implement security controls, and help build security frameworks and tooling for the safe adoption of AI at scale.

You will partner with engineering teams to integrate security throughout the AI development lifecycle, automate security assessments and controls, and contribute to the continuous evolution of our AI security practices. This role combines hands-on security engineering, risk analysis, and applied AI security, requiring strong technical expertise, sound judgment, and a proactive mindset to help ensure the secure and responsible use of AI technologies.

Main Responsibilities

Identify and analyze vulnerabilities, providing insights and recommendations for mitigation;

Contribute to the development and implementation of cutting-edge security frameworks, ensuring the responsible and secure usage within our AI ecosystem;

Work closely with development teams to integrate security measures into the AI development lifecycle;

Assist in incident response planning specific to AI-related security incidents and participate in simulations to test response effectiveness;

Develop and integrate tools to automate security assessments and controls;

Proactively seek knowledge and engage in research and development initiatives to support innovation;

Raise Nubank awareness towards safe AI usage.

Must Have

Knowledge of security frameworks, such as OWASP;

Programming skills in languages commonly used in machine learning (e.g., Python);

Proactive mindset with the ability to analyze complex systems and identify potential security risks;

Strong communication skills to effectively convey complex security concepts to technical and non-technical stakeholders.

Hands-on experience with CI/CD pipelines and implementing security tools (e.g., SAST, DAST, SCA).

Experience with high scalability environments.

Experience in zero-trust and regulated environments.

Nice to Have

Experience with AI frameworks and libraries (e.g. PyTorch, TensorFlow);

Expertise with automation programming languages (e.g. Bash, Ansible, Go);

Knowledge of cloud infrastructure technologies (e.g. AWS, K8S, Terraform);

Knowledge of Machine Learning and Generative AI concepts and technologies (e.g. HuggingFaces, MCP).

Role Location

Hybrid: Belo Horizonte, Rio de Janeiro, São Paulo, Campinas - SP.

Our Benefits

Chance of earning equity at Nubank

Food/ Meal Card (Vale-Refeição and/or Vale Alimentação)

Public Transportation Commuting Benefit (Vale-Transporte)

NuCare – Psychological, Financial and Legal Assistance Program

Life Insurance

Medical Plan

Dental Plan

NuLanguage – Language Course Program

Nucleo - Our learning platform of courses

Extended Parental Leave

Daycare Allowance

Parental Consultancy

Work-from-home Allowance

Gym Partnerships

30 days of paid vacation

Relocation Assistance Package, if applicable

Work Model for this Role

Hybrid 2-3 times/week: Our hybrid work model brings us to the office at least twice a week, on strategic days designed to maximize team connection and collaboration. For more details, visit https://building.nubank.com/nu-hybrid-work-model/

Explore how we build technology at Nubank:

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Our recruitment process may involve the use of artificial intelligence–enabled tools, such as automated interview transcription and analysis, to support the evaluation process. Artificial intelligence is not used to make final hiring decisions; all decisions are made by human reviewers.